uniformitarian

[ yoo-nuh-fawr-mi-tair-ee-uh n ]
/ ˌyu nəˌfɔr mɪˈtɛər i ən /
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adjective

supporting, conforming to, or derived from a theory or doctrine about uniformity, especially on the subject of geology.
Geology. of or relating to the thesis that processes that operated in the remote geological past are not different from those observed now.

noun

a person who accepts or supports a uniformitarian theory.

Origin of uniformitarian

First recorded in 1830–40; uniformit(y) + -arian
Related formsu·ni·form·i·tar·i·an·ism, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for uniformitarianism

British Dictionary definitions for uniformitarianism (1 of 2)

uniformitarianism

/ (ˌjuːnɪˌfɔːmɪˈtɛərɪəˌnɪzəm) /

noun

the concept that the earth's surface was shaped in the past by gradual processes, such as erosion, and by small sudden changes, such as earthquakes, of the type acting today rather than by the sudden divine acts, such as the flood survived by Noah (Genesis 6–8), demanded by the doctrine of catastrophism

British Dictionary definitions for uniformitarianism (2 of 2)

uniformitarian

/ (ˌjuːnɪˌfɔːmɪˈtɛərɪən) /

adjective

of or relating to uniformitarianism
of, characterized by, or conforming to uniformity

noun

a supporter of a theory of uniformity or of uniformitarianism
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for uniformitarianism

uniformitarianism

[ yōō′nə-fôr′mĭ-târē-ə-nĭz′əm ]

The theory that all geologic phenomena may be explained as the result of existing forces having operated uniformly from the origin of the Earth to the present time. See Note at Lyell.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.